1, false break, which means that you think the optical cable is broken, but in fact it is the equipment failure at both ends.

2, the loss is large, and it can be tested by an optical power meter.

3. Discontinuities in optical cables can be realized by using OTDR (Optical Time Domain Reflectometer), which can accurately test breakpoints.

Of course, there is a lot of experience, such as troubleshooting process, precautions and so on. You can deal with cable failures quickly. You should not only use rich experience and professional instruments, but also understand the application of equipment at both ends of the cable.

I wonder if this can answer your question?

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